/*
 * Copyright (c) 2021 Rockchip Electronics Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __MPP_THREAD_H__
#define __MPP_THREAD_H__

#if defined(_WIN32) && !defined(__MINGW32CE__)

/*
 * NOTE: POSIX Threads for Win32
 * Downloaded from http://www.sourceware.org/pthreads-win32/
 */
#include "semaphore.h"
#include "pthread.h"
#pragma comment(lib, "pthreadVC2.lib")

/*
 * add pthread_setname_np for windows
 */
int pthread_setname_np(pthread_t thread, const char *name);

#else

#include <unistd.h>
#include <semaphore.h>
#include <pthread.h>
#include <sys/time.h>

#ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP PTHREAD_RECURSIVE_MUTEX_INITIALIZER
#endif

#endif

#define THREAD_NAME_LEN 16

typedef void *(*MppThreadFunc)(void *);

typedef enum {
    MPP_THREAD_UNINITED,
    MPP_THREAD_RUNNING,
    MPP_THREAD_WAITING,
    MPP_THREAD_STOPPING,
} MppThreadStatus;

#ifdef __cplusplus

#include "mpp_log.h"

class Mutex;
class Condition;

/*
 * for shorter type name and function name
 */
class Mutex {
public:
    Mutex();
    ~Mutex();

    void lock();
    void unlock();
    int  trylock();

    class Autolock {
    public:
        inline Autolock(Mutex* mutex, RK_U32 enable = 1) :
            mEnabled(enable),
            mLock(*mutex)
            {
                if (mEnabled)
                    mLock.lock();
            }
        inline ~Autolock()
        {
            if (mEnabled)
                mLock.unlock();
        }
    private:
        RK_S32 mEnabled;
        Mutex& mLock;
    };

private:
    friend class Condition;

    pthread_mutex_t mMutex;

    Mutex(const Mutex &);
    Mutex &operator = (const Mutex&);
};

inline Mutex::Mutex()
{
    pthread_mutexattr_t attr;
    pthread_mutexattr_init(&attr);
    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
    pthread_mutex_init(&mMutex, &attr);
    pthread_mutexattr_destroy(&attr);
}
inline Mutex::~Mutex()
{
    pthread_mutex_destroy(&mMutex);
}
inline void Mutex::lock()
{
    pthread_mutex_lock(&mMutex);
}
inline void Mutex::unlock()
{
    pthread_mutex_unlock(&mMutex);
}
inline int Mutex::trylock()
{
    return pthread_mutex_trylock(&mMutex);
}

typedef Mutex::Autolock AutoMutex;


/*
 * for shorter type name and function name
 */
class Condition {
public:
    Condition();
    Condition(int type);
    ~Condition();
    RK_S32 wait(Mutex& mutex);
    RK_S32 wait(Mutex* mutex);
    RK_S32 timedwait(Mutex& mutex, RK_S64 timeout);
    RK_S32 timedwait(Mutex* mutex, RK_S64 timeout);
    RK_S32 signal();
    RK_S32 broadcast();

private:
    pthread_cond_t mCond;
};

inline Condition::Condition()
{
    pthread_cond_init(&mCond, NULL);
}
inline Condition::~Condition()
{
    pthread_cond_destroy(&mCond);
}
inline RK_S32 Condition::wait(Mutex& mutex)
{
    return pthread_cond_wait(&mCond, &mutex.mMutex);
}
inline RK_S32 Condition::wait(Mutex* mutex)
{
    return pthread_cond_wait(&mCond, &mutex->mMutex);
}
inline RK_S32 Condition::timedwait(Mutex& mutex, RK_S64 timeout)
{
    return timedwait(&mutex, timeout);
}
inline RK_S32 Condition::timedwait(Mutex* mutex, RK_S64 timeout)
{
    struct timespec ts;

    clock_gettime(CLOCK_REALTIME_COARSE, &ts);

    ts.tv_sec += timeout / 1000; // 1000:Get milliseconds
    ts.tv_nsec += (timeout % 1000) * 1000000; // 1000:Get milliseconds // 1000000:Get seconds
    /* Prevent the out of range at nanoseconds field */
    ts.tv_sec += ts.tv_nsec / 1000000000; // 1000000000:Get seconds
    ts.tv_nsec %= 1000000000; // 1000000000:Get Get nanoseconds

    return pthread_cond_timedwait(&mCond, &mutex->mMutex, &ts);
}
inline RK_S32 Condition::signal()
{
    return pthread_cond_signal(&mCond);
}
inline RK_S32 Condition::broadcast()
{
    return pthread_cond_broadcast(&mCond);
}

class MppMutexCond {
public:
    MppMutexCond() {};
    ~MppMutexCond() {};

    void lock()
    {
        mLock.lock();
    }
    void unlock()
    {
        mLock.unlock();
    }
    void trylock()
    {
        mLock.trylock();
    }
    void wait()
    {
        mCondition.wait(mLock);
    }
    RK_S32 wait(RK_S64 timeout)
    {
        return mCondition.timedwait(mLock, timeout);
    }
    void signal()
    {
        mCondition.signal();
    }
    void broadcast()
    {
        mCondition.broadcast();
    }
    Mutex *mutex()
    {
        return &mLock;
    }

private:
    Mutex mLock;
    Condition mCondition;
};

// Thread lock / signal is distinguished by its source
typedef enum MppThreadSignal_e {
    THREAD_WORK, // for working loop
    THREAD_INPUT, // for thread input
    THREAD_OUTPUT, // for thread output
    THREAD_CONTROL, // for thread async control (reset)
    THREAD_SIGNAL_BUTT,
} MppThreadSignal;

#define THREAD_NORMAL 0
#define THRE 0

class MppThread {
public:
    MppThread(MppThreadFunc func, void *ctx, const char *name = NULL);
    ~MppThread() {};

    MppThreadStatus get_status(MppThreadSignal id = THREAD_WORK);
    void set_status(MppThreadStatus status, MppThreadSignal id = THREAD_WORK);
    void dump_status();

    void start();
    void stop();

    void lock(MppThreadSignal id = THREAD_WORK)
    {
        mpp_assert(id < THREAD_SIGNAL_BUTT);
        mMutexCond[id].lock();
    }

    void unlock(MppThreadSignal id = THREAD_WORK)
    {
        mpp_assert(id < THREAD_SIGNAL_BUTT);
        mMutexCond[id].unlock();
    }

    void wait(MppThreadSignal id = THREAD_WORK)
    {
        mpp_assert(id < THREAD_SIGNAL_BUTT);
        MppThreadStatus status = mStatus[id];

        mStatus[id] = MPP_THREAD_WAITING;
        mMutexCond[id].wait();

        // check the status is not changed then restore status
        if (mStatus[id] == MPP_THREAD_WAITING)
            mStatus[id] = status;
    }

    void signal(MppThreadSignal id = THREAD_WORK)
    {
        mpp_assert(id < THREAD_SIGNAL_BUTT);
        mMutexCond[id].signal();
    }

    Mutex *mutex(MppThreadSignal id = THREAD_WORK)
    {
        mpp_assert(id < THREAD_SIGNAL_BUTT);
        return mMutexCond[id].mutex();
    }

private:
    pthread_t mThread;
    MppMutexCond mMutexCond[THREAD_SIGNAL_BUTT];
    MppThreadStatus mStatus[THREAD_SIGNAL_BUTT];

    MppThreadFunc mFunction;
    char mName[THREAD_NAME_LEN];
    void *mContext;

    MppThread();
    MppThread(const MppThread &);
    MppThread &operator=(const MppThread &);
};

#endif

#endif /* __MPP_THREAD_H__ */